mirror of
https://github.com/django/django.git
synced 2025-10-31 09:41:08 +00:00
651 lines
24 KiB
Python
651 lines
24 KiB
Python
"""
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This module converts requested URLs to callback view functions.
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RegexURLResolver is the main class here. Its resolve() method takes a URL (as
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a string) and returns a tuple in this format:
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(view_function, function_args, function_kwargs)
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"""
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from __future__ import unicode_literals
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import functools
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import re
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import warnings
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from importlib import import_module
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from threading import local
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from django.core.exceptions import ImproperlyConfigured, ViewDoesNotExist
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from django.http import Http404
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from django.utils import lru_cache, six
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from django.utils.datastructures import MultiValueDict
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from django.utils.deprecation import RemovedInDjango20Warning
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from django.utils.encoding import force_str, force_text, iri_to_uri
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from django.utils.functional import lazy
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from django.utils.http import RFC3986_SUBDELIMS, urlquote
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from django.utils.module_loading import module_has_submodule
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from django.utils.regex_helper import normalize
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from django.utils.translation import get_language
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# SCRIPT_NAME prefixes for each thread are stored here. If there's no entry for
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# the current thread (which is the only one we ever access), it is assumed to
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# be empty.
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_prefixes = local()
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# Overridden URLconfs for each thread are stored here.
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_urlconfs = local()
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class ResolverMatch(object):
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def __init__(self, func, args, kwargs, url_name=None, app_name=None, namespaces=None):
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self.func = func
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self.args = args
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self.kwargs = kwargs
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self.url_name = url_name
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self.app_name = app_name
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if namespaces:
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self.namespaces = [x for x in namespaces if x]
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else:
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self.namespaces = []
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self.namespace = ':'.join(self.namespaces)
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if not hasattr(func, '__name__'):
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# A class-based view
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self._func_path = '.'.join([func.__class__.__module__, func.__class__.__name__])
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else:
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# A function-based view
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self._func_path = '.'.join([func.__module__, func.__name__])
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view_path = url_name or self._func_path
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self.view_name = ':'.join(self.namespaces + [view_path])
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def __getitem__(self, index):
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return (self.func, self.args, self.kwargs)[index]
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def __repr__(self):
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return "ResolverMatch(func=%s, args=%s, kwargs=%s, url_name=%s, app_name=%s, namespaces=%s)" % (
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self._func_path, self.args, self.kwargs, self.url_name, self.app_name, self.namespaces)
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class Resolver404(Http404):
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pass
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class NoReverseMatch(Exception):
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pass
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@lru_cache.lru_cache(maxsize=None)
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def get_callable(lookup_view, can_fail=False):
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"""
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Return a callable corresponding to lookup_view. This function is used
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by both resolve() and reverse(), so can_fail allows the caller to choose
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between returning the input as is and raising an exception when the input
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string can't be interpreted as an import path.
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If lookup_view is already a callable, return it.
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If lookup_view is a string import path that can be resolved to a callable,
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import that callable and return it.
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If lookup_view is some other kind of string and can_fail is True, the string
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is returned as is. If can_fail is False, an exception is raised (either
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ImportError or ViewDoesNotExist).
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"""
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if callable(lookup_view):
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return lookup_view
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mod_name, func_name = get_mod_func(lookup_view)
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if not func_name: # No '.' in lookup_view
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if can_fail:
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return lookup_view
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else:
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raise ImportError(
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"Could not import '%s'. The path must be fully qualified." %
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lookup_view)
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try:
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mod = import_module(mod_name)
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except ImportError:
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if can_fail:
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return lookup_view
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else:
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parentmod, submod = get_mod_func(mod_name)
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if submod and not module_has_submodule(import_module(parentmod), submod):
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raise ViewDoesNotExist(
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"Could not import '%s'. Parent module %s does not exist." %
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(lookup_view, mod_name))
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else:
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raise
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else:
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try:
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view_func = getattr(mod, func_name)
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except AttributeError:
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if can_fail:
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return lookup_view
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else:
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raise ViewDoesNotExist(
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"Could not import '%s'. View does not exist in module %s." %
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(lookup_view, mod_name))
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else:
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if not callable(view_func):
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# For backwards compatibility this is raised regardless of can_fail
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raise ViewDoesNotExist(
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"Could not import '%s.%s'. View is not callable." %
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(mod_name, func_name))
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return view_func
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@lru_cache.lru_cache(maxsize=None)
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def get_resolver(urlconf):
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if urlconf is None:
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from django.conf import settings
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urlconf = settings.ROOT_URLCONF
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return RegexURLResolver(r'^/', urlconf)
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@lru_cache.lru_cache(maxsize=None)
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def get_ns_resolver(ns_pattern, resolver):
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# Build a namespaced resolver for the given parent urlconf pattern.
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# This makes it possible to have captured parameters in the parent
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# urlconf pattern.
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ns_resolver = RegexURLResolver(ns_pattern, resolver.url_patterns)
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return RegexURLResolver(r'^/', [ns_resolver])
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def get_mod_func(callback):
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# Converts 'django.views.news.stories.story_detail' to
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# ['django.views.news.stories', 'story_detail']
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try:
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dot = callback.rindex('.')
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except ValueError:
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return callback, ''
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return callback[:dot], callback[dot + 1:]
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class LocaleRegexProvider(object):
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"""
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A mixin to provide a default regex property which can vary by active
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language.
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"""
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def __init__(self, regex):
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# regex is either a string representing a regular expression, or a
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# translatable string (using ugettext_lazy) representing a regular
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# expression.
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self._regex = regex
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self._regex_dict = {}
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@property
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def regex(self):
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"""
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Returns a compiled regular expression, depending upon the activated
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language-code.
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"""
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language_code = get_language()
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if language_code not in self._regex_dict:
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if isinstance(self._regex, six.string_types):
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regex = self._regex
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else:
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regex = force_text(self._regex)
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try:
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compiled_regex = re.compile(regex, re.UNICODE)
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except re.error as e:
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raise ImproperlyConfigured(
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'"%s" is not a valid regular expression: %s' %
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(regex, six.text_type(e)))
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self._regex_dict[language_code] = compiled_regex
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return self._regex_dict[language_code]
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class RegexURLPattern(LocaleRegexProvider):
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def __init__(self, regex, callback, default_args=None, name=None):
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LocaleRegexProvider.__init__(self, regex)
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# callback is either a string like 'foo.views.news.stories.story_detail'
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# which represents the path to a module and a view function name, or a
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# callable object (view).
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if callable(callback):
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self._callback = callback
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else:
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self._callback = None
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self._callback_str = callback
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self.default_args = default_args or {}
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self.name = name
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def __repr__(self):
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return force_str('<%s %s %s>' % (self.__class__.__name__, self.name, self.regex.pattern))
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def add_prefix(self, prefix):
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"""
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Adds the prefix string to a string-based callback.
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"""
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if not prefix or not hasattr(self, '_callback_str'):
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return
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self._callback_str = prefix + '.' + self._callback_str
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def resolve(self, path):
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match = self.regex.search(path)
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if match:
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# If there are any named groups, use those as kwargs, ignoring
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# non-named groups. Otherwise, pass all non-named arguments as
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# positional arguments.
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kwargs = match.groupdict()
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if kwargs:
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args = ()
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else:
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args = match.groups()
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# In both cases, pass any extra_kwargs as **kwargs.
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kwargs.update(self.default_args)
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return ResolverMatch(self.callback, args, kwargs, self.name)
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@property
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def callback(self):
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if self._callback is not None:
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return self._callback
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self._callback = get_callable(self._callback_str)
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return self._callback
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class RegexURLResolver(LocaleRegexProvider):
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def __init__(self, regex, urlconf_name, default_kwargs=None, app_name=None, namespace=None):
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LocaleRegexProvider.__init__(self, regex)
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# urlconf_name is a string representing the module containing URLconfs.
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self.urlconf_name = urlconf_name
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if not isinstance(urlconf_name, six.string_types):
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self._urlconf_module = self.urlconf_name
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self.callback = None
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self.default_kwargs = default_kwargs or {}
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self.namespace = namespace
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self.app_name = app_name
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self._reverse_dict = {}
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self._namespace_dict = {}
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self._app_dict = {}
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# set of dotted paths to all functions and classes that are used in
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# urlpatterns
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self._callback_strs = set()
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self._populated = False
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def __repr__(self):
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if isinstance(self.urlconf_name, list) and len(self.urlconf_name):
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# Don't bother to output the whole list, it can be huge
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urlconf_repr = '<%s list>' % self.urlconf_name[0].__class__.__name__
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else:
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urlconf_repr = repr(self.urlconf_name)
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return str('<%s %s (%s:%s) %s>') % (
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self.__class__.__name__, urlconf_repr, self.app_name,
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self.namespace, self.regex.pattern)
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def _populate(self):
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lookups = MultiValueDict()
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namespaces = {}
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apps = {}
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language_code = get_language()
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for pattern in reversed(self.url_patterns):
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if hasattr(pattern, '_callback_str'):
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self._callback_strs.add(pattern._callback_str)
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elif hasattr(pattern, '_callback'):
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callback = pattern._callback
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if isinstance(callback, functools.partial):
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callback = callback.func
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if not hasattr(callback, '__name__'):
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lookup_str = callback.__module__ + "." + callback.__class__.__name__
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else:
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lookup_str = callback.__module__ + "." + callback.__name__
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self._callback_strs.add(lookup_str)
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p_pattern = pattern.regex.pattern
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if p_pattern.startswith('^'):
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p_pattern = p_pattern[1:]
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if isinstance(pattern, RegexURLResolver):
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if pattern.namespace:
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namespaces[pattern.namespace] = (p_pattern, pattern)
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if pattern.app_name:
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apps.setdefault(pattern.app_name, []).append(pattern.namespace)
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else:
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parent_pat = pattern.regex.pattern
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for name in pattern.reverse_dict:
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for matches, pat, defaults in pattern.reverse_dict.getlist(name):
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new_matches = normalize(parent_pat + pat)
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lookups.appendlist(
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name,
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(
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new_matches,
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p_pattern + pat,
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dict(defaults, **pattern.default_kwargs),
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)
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)
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for namespace, (prefix, sub_pattern) in pattern.namespace_dict.items():
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namespaces[namespace] = (p_pattern + prefix, sub_pattern)
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for app_name, namespace_list in pattern.app_dict.items():
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apps.setdefault(app_name, []).extend(namespace_list)
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self._callback_strs.update(pattern._callback_strs)
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else:
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bits = normalize(p_pattern)
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lookups.appendlist(pattern.callback, (bits, p_pattern, pattern.default_args))
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if pattern.name is not None:
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lookups.appendlist(pattern.name, (bits, p_pattern, pattern.default_args))
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self._reverse_dict[language_code] = lookups
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self._namespace_dict[language_code] = namespaces
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self._app_dict[language_code] = apps
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self._populated = True
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@property
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def reverse_dict(self):
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language_code = get_language()
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if language_code not in self._reverse_dict:
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self._populate()
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return self._reverse_dict[language_code]
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@property
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def namespace_dict(self):
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language_code = get_language()
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if language_code not in self._namespace_dict:
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self._populate()
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return self._namespace_dict[language_code]
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@property
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def app_dict(self):
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language_code = get_language()
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if language_code not in self._app_dict:
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self._populate()
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return self._app_dict[language_code]
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def _is_callback(self, name):
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if not self._populated:
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self._populate()
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return name in self._callback_strs
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def resolve(self, path):
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path = force_text(path) # path may be a reverse_lazy object
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tried = []
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match = self.regex.search(path)
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if match:
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new_path = path[match.end():]
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for pattern in self.url_patterns:
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try:
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sub_match = pattern.resolve(new_path)
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except Resolver404 as e:
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sub_tried = e.args[0].get('tried')
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if sub_tried is not None:
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tried.extend([pattern] + t for t in sub_tried)
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else:
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tried.append([pattern])
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else:
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if sub_match:
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sub_match_dict = dict(match.groupdict(), **self.default_kwargs)
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sub_match_dict.update(sub_match.kwargs)
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return ResolverMatch(
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sub_match.func,
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sub_match.args,
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sub_match_dict,
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sub_match.url_name,
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self.app_name or sub_match.app_name,
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[self.namespace] + sub_match.namespaces
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)
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tried.append([pattern])
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raise Resolver404({'tried': tried, 'path': new_path})
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raise Resolver404({'path': path})
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@property
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def urlconf_module(self):
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try:
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return self._urlconf_module
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except AttributeError:
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self._urlconf_module = import_module(self.urlconf_name)
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return self._urlconf_module
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@property
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def url_patterns(self):
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# urlconf_module might be a valid set of patterns, so we default to it
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patterns = getattr(self.urlconf_module, "urlpatterns", self.urlconf_module)
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try:
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iter(patterns)
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except TypeError:
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msg = (
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"The included urlconf '{name}' does not appear to have any "
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"patterns in it. If you see valid patterns in the file then "
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"the issue is probably caused by a circular import."
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)
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raise ImproperlyConfigured(msg.format(name=self.urlconf_name))
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return patterns
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def resolve_error_handler(self, view_type):
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callback = getattr(self.urlconf_module, 'handler%s' % view_type, None)
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if not callback:
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# No handler specified in file; use default
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# Lazy import, since django.urls imports this file
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from django.conf import urls
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callback = getattr(urls, 'handler%s' % view_type)
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return get_callable(callback), {}
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def reverse(self, lookup_view, *args, **kwargs):
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return self._reverse_with_prefix(lookup_view, '', *args, **kwargs)
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def _reverse_with_prefix(self, lookup_view, _prefix, *args, **kwargs):
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if args and kwargs:
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raise ValueError("Don't mix *args and **kwargs in call to reverse()!")
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text_args = [force_text(v) for v in args]
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text_kwargs = {k: force_text(v) for (k, v) in kwargs.items()}
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if not self._populated:
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self._populate()
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original_lookup = lookup_view
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try:
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if self._is_callback(lookup_view):
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lookup_view = get_callable(lookup_view, True)
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except (ImportError, AttributeError) as e:
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raise NoReverseMatch("Error importing '%s': %s." % (lookup_view, e))
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else:
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if not callable(original_lookup) and callable(lookup_view):
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warnings.warn(
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'Reversing by dotted path is deprecated (%s).' % original_lookup,
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RemovedInDjango20Warning, stacklevel=3
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)
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possibilities = self.reverse_dict.getlist(lookup_view)
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prefix_norm, prefix_args = normalize(urlquote(_prefix))[0]
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for possibility, pattern, defaults in possibilities:
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for result, params in possibility:
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if args:
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if len(args) != len(params) + len(prefix_args):
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continue
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candidate_subs = dict(zip(prefix_args + params, text_args))
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else:
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if (set(kwargs.keys()) | set(defaults.keys()) != set(params) |
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set(defaults.keys()) | set(prefix_args)):
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continue
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matches = True
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for k, v in defaults.items():
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if kwargs.get(k, v) != v:
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matches = False
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break
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if not matches:
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continue
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candidate_subs = text_kwargs
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# WSGI provides decoded URLs, without %xx escapes, and the URL
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# resolver operates on such URLs. First substitute arguments
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# without quoting to build a decoded URL and look for a match.
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# Then, if we have a match, redo the substitution with quoted
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# arguments in order to return a properly encoded URL.
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candidate_pat = prefix_norm.replace('%', '%%') + result
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if re.search('^%s%s' % (prefix_norm, pattern), candidate_pat % candidate_subs, re.UNICODE):
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# safe characters from `pchar` definition of RFC 3986
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candidate_subs = dict((k, urlquote(v, safe=RFC3986_SUBDELIMS + str('/~:@')))
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for (k, v) in candidate_subs.items())
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url = candidate_pat % candidate_subs
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# Don't allow construction of scheme relative urls.
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if url.startswith('//'):
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url = '/%%2F%s' % url[2:]
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return url
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# lookup_view can be URL label, or dotted path, or callable, Any of
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# these can be passed in at the top, but callables are not friendly in
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# error messages.
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m = getattr(lookup_view, '__module__', None)
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n = getattr(lookup_view, '__name__', None)
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if m is not None and n is not None:
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lookup_view_s = "%s.%s" % (m, n)
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else:
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lookup_view_s = lookup_view
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patterns = [pattern for (possibility, pattern, defaults) in possibilities]
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raise NoReverseMatch("Reverse for '%s' with arguments '%s' and keyword "
|
|
"arguments '%s' not found. %d pattern(s) tried: %s" %
|
|
(lookup_view_s, args, kwargs, len(patterns), patterns))
|
|
|
|
|
|
class LocaleRegexURLResolver(RegexURLResolver):
|
|
"""
|
|
A URL resolver that always matches the active language code as URL prefix.
|
|
|
|
Rather than taking a regex argument, we just override the ``regex``
|
|
function to always return the active language-code as regex.
|
|
"""
|
|
def __init__(self, urlconf_name, default_kwargs=None, app_name=None, namespace=None):
|
|
super(LocaleRegexURLResolver, self).__init__(
|
|
None, urlconf_name, default_kwargs, app_name, namespace)
|
|
|
|
@property
|
|
def regex(self):
|
|
language_code = get_language()
|
|
if language_code not in self._regex_dict:
|
|
regex_compiled = re.compile('^%s/' % language_code, re.UNICODE)
|
|
self._regex_dict[language_code] = regex_compiled
|
|
return self._regex_dict[language_code]
|
|
|
|
|
|
def resolve(path, urlconf=None):
|
|
if urlconf is None:
|
|
urlconf = get_urlconf()
|
|
return get_resolver(urlconf).resolve(path)
|
|
|
|
|
|
def reverse(viewname, urlconf=None, args=None, kwargs=None, prefix=None, current_app=None):
|
|
if urlconf is None:
|
|
urlconf = get_urlconf()
|
|
resolver = get_resolver(urlconf)
|
|
args = args or []
|
|
kwargs = kwargs or {}
|
|
|
|
if prefix is None:
|
|
prefix = get_script_prefix()
|
|
|
|
if not isinstance(viewname, six.string_types):
|
|
view = viewname
|
|
else:
|
|
parts = viewname.split(':')
|
|
parts.reverse()
|
|
view = parts[0]
|
|
path = parts[1:]
|
|
|
|
resolved_path = []
|
|
ns_pattern = ''
|
|
while path:
|
|
ns = path.pop()
|
|
|
|
# Lookup the name to see if it could be an app identifier
|
|
try:
|
|
app_list = resolver.app_dict[ns]
|
|
# Yes! Path part matches an app in the current Resolver
|
|
if current_app and current_app in app_list:
|
|
# If we are reversing for a particular app,
|
|
# use that namespace
|
|
ns = current_app
|
|
elif ns not in app_list:
|
|
# The name isn't shared by one of the instances
|
|
# (i.e., the default) so just pick the first instance
|
|
# as the default.
|
|
ns = app_list[0]
|
|
except KeyError:
|
|
pass
|
|
|
|
try:
|
|
extra, resolver = resolver.namespace_dict[ns]
|
|
resolved_path.append(ns)
|
|
ns_pattern = ns_pattern + extra
|
|
except KeyError as key:
|
|
if resolved_path:
|
|
raise NoReverseMatch(
|
|
"%s is not a registered namespace inside '%s'" %
|
|
(key, ':'.join(resolved_path)))
|
|
else:
|
|
raise NoReverseMatch("%s is not a registered namespace" %
|
|
key)
|
|
if ns_pattern:
|
|
resolver = get_ns_resolver(ns_pattern, resolver)
|
|
|
|
return force_text(iri_to_uri(resolver._reverse_with_prefix(view, prefix, *args, **kwargs)))
|
|
|
|
reverse_lazy = lazy(reverse, six.text_type)
|
|
|
|
|
|
def clear_url_caches():
|
|
get_callable.cache_clear()
|
|
get_resolver.cache_clear()
|
|
get_ns_resolver.cache_clear()
|
|
|
|
|
|
def set_script_prefix(prefix):
|
|
"""
|
|
Sets the script prefix for the current thread.
|
|
"""
|
|
if not prefix.endswith('/'):
|
|
prefix += '/'
|
|
_prefixes.value = prefix
|
|
|
|
|
|
def get_script_prefix():
|
|
"""
|
|
Returns the currently active script prefix. Useful for client code that
|
|
wishes to construct their own URLs manually (although accessing the request
|
|
instance is normally going to be a lot cleaner).
|
|
"""
|
|
return getattr(_prefixes, "value", '/')
|
|
|
|
|
|
def clear_script_prefix():
|
|
"""
|
|
Unsets the script prefix for the current thread.
|
|
"""
|
|
try:
|
|
del _prefixes.value
|
|
except AttributeError:
|
|
pass
|
|
|
|
|
|
def set_urlconf(urlconf_name):
|
|
"""
|
|
Sets the URLconf for the current thread (overriding the default one in
|
|
settings). Set to None to revert back to the default.
|
|
"""
|
|
if urlconf_name:
|
|
_urlconfs.value = urlconf_name
|
|
else:
|
|
if hasattr(_urlconfs, "value"):
|
|
del _urlconfs.value
|
|
|
|
|
|
def get_urlconf(default=None):
|
|
"""
|
|
Returns the root URLconf to use for the current thread if it has been
|
|
changed from the default one.
|
|
"""
|
|
return getattr(_urlconfs, "value", default)
|
|
|
|
|
|
def is_valid_path(path, urlconf=None):
|
|
"""
|
|
Returns True if the given path resolves against the default URL resolver,
|
|
False otherwise.
|
|
|
|
This is a convenience method to make working with "is this a match?" cases
|
|
easier, avoiding unnecessarily indented try...except blocks.
|
|
"""
|
|
try:
|
|
resolve(path, urlconf)
|
|
return True
|
|
except Resolver404:
|
|
return False
|